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Astron. Astrophys. 322, 730-746 (1997) AcknowledgementsWe have made use of data from the Lyon-Meudon Extragalactic Database (LEDA) compiled by the LEDA team at the CRAL-Observatoire de Lyon (France). We are very grateful to Allan Sandage for his detailed and useful comments.
© European Southern Observatory (ESO) 1997 Online publication: June 5, 1998 ![]() |